The photoionization mechanism of LINERs: stellar and nonstellar |
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Authors: | Luis C Ho Alexei V Filippenko |
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Institution: | (1) Department of Astronomy, University of California, Berkeley, CA, USA |
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Abstract: | We present high quality spectroscopic observations of a sample of 14 low ionization nuclear emission-line regions (LINERs). Starlight removal is achieved by the subtraction of a suitable absorption-line template galaxy, allowing accurate measurements of emission lines. We use these line fluxes to examine the possible excitation mechanisms of LINERs. We suggest that LINERs with weak O I] 6300 emission (O I]/H < 1/6) may beH II regions photoionized by unusually hot O-type stars. LINERs with O I]/H < 1/6 may be powered by photoionization from a nonstellar continuum. This is supported by the detection of broad h emission, a correlation between line width and critical density, and point-like X-ray emission in several of these objects. |
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